Polishing disk



Oct. 26, 1943. c. F. scHLEGEL POLISHING DISK Original Filed Feb. l1, 1939 .ij j

:HEHIIIIIIIII @Z 7. l BY @AMM/1 7 is ATTORNEYS Patented Oct. 26, 1943 POLISHING DSK Carl F. Schlegel, Brighton, Y., assigner to 'The Schlegel Manufacturing Company, Rochester, N. Y., a corporation of New York Original 'application February 11, 1'9i`9Serial No. 255,920. Divided and this 4si);initiation Maio-h 1-7, 1942, Serial No. 435,056 1 s claims. (ci. lsazsei This application is a division of my parent application for United States Letters Patent, Serial No. 255,920, filed February 11, 1939.

This invention relates to a polishing disk, particularly that type of polishing disk intended to be rotated by a spindle from a suitable source of power While in contact with the work to 'be polished.

An object of my invention is to provide a generally improved and more satisfactory polishing disk of simple construction which is relatively inexpensive to build, and sturdy andl effective in use. y

Another object of my invention is the provision loi. a polishing diskcomprising a multijplicity of separate polishing fibers or strands, secured to a flexible 'supporter backing, by means affording a ready control of the density 'or coin-A pactness of the mass of strands so as to vary p the softness of the body of strandsand the disk as awhole.'

panying drawing, in which:

Fig. l is a sectional vievv'taken through 'the polishing disk of my invention; i i

Fig. 2 is a sectional view, similar to ing. 1,'

showing a modified form of the invention;

Fig. 3 is a sectional view, similar to Fig. 1,

showing another modified form of. my invention,

and

Fig 4 is a View illustrating be iiexed in use.

The polishing bers or strands I i oi the polishing disk of my invention may be of any suitable material, although I preferably employ one or more of the textile fibers such as cotton, linen, Wool, flax, jute, hemp, silk, or rayon. Of these, for example, I have found that cotton and Wool bers are quite satisfactory where a soft texture is desired, as for imparting a gloss finish to a painted, lacquered, or polishedsurface.

Preferably in making the disk a number of fibers or strands are tied together by any suitable how the disk may material, as indicated at I2, to provide a grouped" bunch or tuft of strands or fibers. The tufting or bunching of the strands facilitates handling of the bers during manufacture of the disk, and also confines the strands adjacent their anchored ends While permitting them to bush out and form a thick and substantial mass of fringe adjacent the polishing face. The outer polishing face of this mass of fringe is formed by the ends of the individual strands. "rho strands are thus `presented endwse 'come 'into endwise bearing reiatioiiship 'with the jto be polish'ed. The individual are -'carried by a `body portion or disk, generally indicated by 'the numeral i3., a nii'rrjb'er oitiiits being secured to the disk substantially in the ion'n of an annul'us around a 'contrai at'taohin'ghuo la. j

"one of the advantages of invention is that the tufts may be spaced .as desired so as 'to yvary the density oi the mass of the 'nbiers at "the polishing race for the particular to be ,aecompli'siied Preferably the tuftsjarespa'ced in close enough ireletionjthat .iii the outer polishing face i IS fthe V'strands 'of adi'ai'z'e'nt` tufts are I'closely packe-d together, lits shown atie. The polishing face or 'the disk thus appearssubst'antiaily as a densely pack'fd mass flplisliing elements,

The hun I4 be or suitable material, but is preferably `of fa material which is siiinoiently rigid to `provids on attaching hub for the spindle foi a iotatabiedriver, but suiiio'ientiy pliant 'to enable 't to -be'nd vvh'e'n subjected 'to an appreciable 'defieeting toros.' For` example, the

compressed hemp, or semi-hard rubber. The disks ofthe attaching hub are provided With apertures I 'l v'ffor vthe reception ofthe driving spindle.

The b'o'dy portion of the y disk also has a backing 'or 'an'chori'ng .section '2'0 for the tufts which Il'ay be of a `'niater'ialwhich is floWable, but which upon curing or hardening is somewhat exible and serves to bond the individual fibers together and the tufts to each other. I have found latex to be Very suitable for this purpose.

Bonded to the outer surface of the disk by the latex backing section 20 is a backing sheet i8 of a tough, strong, preferably fabric material such as canvas or buckram. By using a softer or stiffer backing sheet I8 or by using several layers of backing material the strength and rigidity of the polishing disk may be Varied to suit the conditions of use to which the disk is to be applied.` In addition, the backing sheet i3 serves to give greater strength to the disk and hold the latex backing section in position When subjected to the high centrifugal force caused upon rotation of the disk at high velocity. The backing sheet is provided With an aperture iii registering With the apertures Il in the attaching hub.

One method by Which the disk may be conveniently made is to provide a mold or fol-rn having sides to coniine the latex at the surfaces 2i, 22, and 23. The backing sheet I8 is placed adjacent ing sheet I8, and the tufts are bonded together` through the latex backing section. After curing the latex by any well known method, the polishing disk may be removed from the mold and appears as shown in Fig. 1. z j

In Fig. 2 I have show'n a modified form of my invention wherein the tufts are not'tied together.

hard rubber disk 26. other modified form of my invention wherein the attaching hub 21 is made of semi-hardrubber. Also in this modification insteadv o f each strand of each tuft being separate as shown in Figs. l and 2, the strands are tied, as'indicated at 29. so that the center of the strands is anchored in the latex backing section while the ends 3U form the polishing face. This 'method of forming the tufts provides a somewhat better' anchorage for the tufts. y

The polishing disk of my invention may be :inexpensively fabricated." Because of its Viiexibility, as illustrated in Fig. 4, it is admirably adapted to reach in betweenangularly disposed sections or crevices and for `curved surfaces. For this reason it is particularlyiadapted for polishing'au-` tomobile bodies. Moreover, the use of individual tufts makes it'very` easy to control the density of the mass of the polishing bers at the polishing face' by varying the spacing of the tufts.

While Ihave shown thepreferred forms of my invention, it will be apparent that various other variations and changes may be made, particu"- larly in the form and relation of parts, Without departing from the spirit of my invention as 'set' material on one face of said sheet, and a mul-` In this modification I have shown the attaching hub as being formed of a single preferably semi- In Fig. 3 I have shown` antiplicity of separate tufts each composed of a multiplicity of unwoven, twisted strands of relatively soft brous material embedded at one end in said layer and having their opposite free ends forming a polishing face, said strands being tenaciously bonded together and to said backing sheet by said latex layer to form a durable unitary structure, said sheet and layer having a central opening therethrough to receive a rotary driving spindle for said disk, and said tufts hav- 4ing va predetermined spacing from one 'nother and from said opening to aiord a desired densityv of strandsat said polishing face and an unrtufted area yfor the reception of disk clamping means on said spindle.

2. A relatively soft, exible polishing disk comprising a circular backing and reinforcing sheet of strong exible fabric, a layer of iiexible latex material on one face of said sheet, a supporting ring of eXible material concentric with said sheet, and a multiplicity of unwoven, twisted strandsof relatively soft fibrous materialVv ernbedded at one end in said layer about said supporting ringand having their. opposite free ends orminga polishing face, said latex layer -penetrating forfa substantial distance between said strands and serving to tenaciously bond said strands and said sheet and supporting rring together and said sheet, layer, and ring having a central openingtherethrough spaced fro'msaid strands .for the reception of clamping means on a rotary driving spindle for said polishingmdisk.

3. A relatively soft.` flexible polishing disk com-Y prising a circular backing and reinforcing sheet of strongy eXible. fabric, aflayer of exible latex material on'on'e face' of said sheet, a supporting ring of flexibleV r'na'ite'rial concentric with said sheet and a"riultiplicityv of separate'tufts each composed ofl a multiplicity of unwoven twisted strands of relatively/soft fibrousy materialV embedded at lone end in said layer about said supporting ring and having their oppositefree ends forming'a polishing'face, said lateXlaye'r serving to tenaciously' bond said strands and said' sheet and supporting ring.; tbgether, and `said sheet, layer, a'n'd ring .havingy av central opening therethrough spaced from said'tufts for'the reception of a rotary` driving spindle provided withmeans for clamping said polishing disk.

j CARL MSCHLEGEL. 

